Using Digital Inputs with 24V logic

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24 Apr 2007
Posts: 73

Is it possible that the Digital Inputs can work with 24V ?



24V logic should not cause a problem for the Cleverscope but it may not work reliably as it is getting close to the threshold for the input device. Our recommendation is to use a series resistor to ensure it stays within the acceptable range.

The input has a 75k|27k resistor network built into the CS1004/5 to give a 4:1 ratio. If you add another 100k in series with the inputs you will have roughly 8:1 which will give plenty of headroom. Note that the trigger level will then have a range of 0 – 16V and the high frequency performance will be reduced. This should not be a problem as any logic operating at that voltage is unlikely to be fast.
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